Chapter 3 - Electrical Terminology

Question 1

EMF (electromotive force) is also known as?

Answer 1

Volt.

Question 2

In order for current to flow, there must be voltage and a___

Answer 2

Closed circuit.

Question 3

Define resistance.

Answer 3

An opposition to the free flow of current.

Question 4

Define power.

Answer 4

The rate at which work is being done. (measured in current)

Question 5

Work is a force applied over a distance. If twice the force is applied over half the distance, is the amount of work done the same?

Answer 5

Yes.

Question 6

If power is voltage times current, is half the voltage and twice the current the same amount of power?

Answer 6

Yes.

Question 7

True or false: Electricity is a form of energy.

Answer 7

True.

Question 8

Energy is power times ____.

Answer 8

Energy is power times time.

Question 9

According to the law of conservation of energy, energy can neither be ______.

Answer 9

Created nor destroyed.

Question 10

Can current flow in a circuit without voltage?

Answer 10

No.

Question 11

The ampere is a unit of measure of ____?

Answer 11

Current.

Question 12

Define a volt.

Answer 12

The potential difference across a 1 watt load with a current of 1 amp.

Question 13

Define an ohm.

Answer 13

The amount of resistance that will produce voltage drop of 1 volt given 1 amp of current.

Question 14

What is the inverse of resistance?

Answer 14

Conductivity.

Question 15

What does voltage do?

Answer 15

Provides force that causes electrons to flow through a conductor.

Question 16

What is current?

Answer 16

The flow of electrons.

Question 17

Resistance is increased with:

Answer 17

Length, increasing temperature, decreasing cross-sectional diameter of a conductor.

Question 18

Resistance in a circuit affects:

Answer 18

Applied voltage, amount of current that flows, amount of energy used.

Question 19

Power is the product of _____.

Answer 19

Voltage and current at any instant in time.

Question 20

What is energy?

Answer 20

Power over time.

Question 21

Is energy the same as power?

Answer 21

No. Electricity is a form of energy, but energy is not the same as power.

Question 22

Define an amp.

Answer 22

The amount of force produced by two current-carrying conductors.

Question 23

What determines the category of a meter?

Answer 23

Intended use, ability to withstand transient over voltages, distance to power source.

Question 24

What is a category IV meter used for?

Answer 24

Portable power generators, electrical meters, primary side of feeder transformers, primary overcurrent protection equipment, outdoor conductors.

Question 25

What is a category III meter used for?

Answer 25

Feeder, dimmer racks, secondary side of feeder transformers, breaker panels, company switches, disconnects

Question 26

What is a category II meter used for?

Answer 26

Single-phase loads connected to receptacles, appliances, branch circuits, receptacles more than 1- meters from a category II source or more than 20 meters from a category IV source.

Question 27

What is a category I meter used for?

Answer 27

Low voltage electronics & signal-level measurements like PC boards and components.